OsdEnvironment.c revision 215023 
1/*-
2 * Copyright (c) 2000,2001 Michael Smith
3 * Copyright (c) 2000 BSDi
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: head/sys/ia64/acpica/OsdEnvironment.c 215023 2010-11-09 00:14:39Z jkim $");
30
31#include <sys/types.h>
32#include <sys/linker_set.h>
33#include <sys/sysctl.h>
34#include <machine/efi.h>
35
36#include <contrib/dev/acpica/include/acpi.h>
37
38static u_long acpi_root_phys;
39
40SYSCTL_ULONG(_machdep, OID_AUTO, acpi_root, CTLFLAG_RD, &acpi_root_phys, 0,
41    "The physical address of the RSDP");
42
43ACPI_STATUS
44AcpiOsInitialize(void)
45{
46
47	return (AE_OK);
48}
49
50ACPI_STATUS
51AcpiOsTerminate(void)
52{
53
54	return (AE_OK);
55}
56
57static u_long
58acpi_get_root_from_efi(void)
59{
60	static struct uuid acpi_root_uuid = EFI_TABLE_ACPI20;
61	void *acpi_root;
62
63	acpi_root = efi_get_table(&acpi_root_uuid);
64	if (acpi_root != NULL)
65		return (IA64_RR_MASK((uintptr_t)acpi_root));
66
67	return (0);
68}
69
70ACPI_PHYSICAL_ADDRESS
71AcpiOsGetRootPointer(void)
72{
73
74	if (acpi_root_phys == 0)
75		acpi_root_phys = acpi_get_root_from_efi();
76
77	return (acpi_root_phys);
78}
79